Word Search bug-fixes + Codex polish

Two reported bugs, same root cause: the fixed-cell grid overflowed its wrapper
on Large, so (a) the last column spilled past the border and (b) the pointer→cell
math drifted across the row, recording finds "off by a letter".
* Grid now uses 1fr columns with max-width = n·32px: the board grows with the
  grid and can never overflow (shrinks to fit a narrow phone instead).
* cellAt() accounts for the grid padding/border, so selection is exact edge-to-edge.
* restore() now validates each saved find against the CURRENT grid and drops any
  whose cells no longer spell the word — clears stale highlights if the day's
  puzzle changed.

Codex follow-ups:
* _ws_propose now requires >= large.count + 4 valid words before accepting an LLM
  proposal (else falls back to a curated theme), so a thin LLM result can't
  underfill Large. Added a thin-LLM fallback test.
* Cleaned Svelte warnings: removed the now-unused .gamecard.soon CSS, added an
  ARIA role/label to the grid, declared gridEl with $state. Build is warning-clean.
* Added a stale-load guard in WordSearchGame.load() so rapid size switches can't
  let an older request overwrite the newer selection.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

goodnews/games.py

@@ -162,7 +162,10 @@ _DIRS = [(-1, -1), (-1, 0), (-1, 1), (0, -1), (0, 1), (1, -1), (1, 0), (1, 1)]
 # stored theme+word list, sampling a different subset per size so each is its own
 # puzzle, while all three share the day's theme.
 WS_TIERS = {"small": {"grid": 8, "count": 6}, "med": {"grid": 11, "count": 10}, "large": {"grid": 14, "count": 14}}
-WS_TARGET = 28  # words to gather per theme, so there's variety to sample from
+WS_TARGET = 28      # words to ask the LLM for, so there's variety to sample from
+# Only accept an LLM proposal with enough words to fill Large with room to spare;
+# otherwise fall back to a curated theme (which always has plenty).
+WS_MIN_ACCEPT = WS_TIERS["large"]["count"] + 4
 
 # Curated fallbacks — calm and neutral everyday scenes, not just upbeat. ~22 words
 # each (4–8 letters, uppercase) so every size has a fresh subset to draw from.
@@ -217,7 +220,7 @@ def _ws_propose(client) -> tuple[str, list[str]] | None:
             elif s.upper().startswith("WORDS:"):
                 words = [w.strip().upper() for w in re.split(r"[,\s]+", s.split(":", 1)[1]) if w.strip()]
         words = [w for w in dict.fromkeys(words) if w.isalpha() and 4 <= len(w) <= 8]
-        if theme and len(words) >= 6:
+        if theme and len(words) >= WS_MIN_ACCEPT:  # enough to fill Large + spare
             return theme, words
     except Exception:  # noqa: BLE001 — fall back to a curated theme
         pass